{ config, lib, pkgs, ... }: with lib; let cfg = config.services.opensmtpd; conf = pkgs.writeText "smtpd.conf" cfg.serverConfiguration; args = concatStringsSep " " cfg.extraServerArgs; sendmail = pkgs.runCommand "opensmtpd-sendmail" { preferLocalBuild = true; } '' mkdir -p $out/bin ln -s ${cfg.package}/sbin/smtpctl $out/bin/sendmail ''; in { ###### interface imports = [ (mkRenamedOptionModule [ "services" "opensmtpd" "addSendmailToSystemPath" ] [ "services" "opensmtpd" "setSendmail" ]) ]; options = { services.opensmtpd = { enable = mkOption { type = types.bool; default = false; description = "Whether to enable the OpenSMTPD server."; }; package = mkOption { type = types.package; default = pkgs.opensmtpd; defaultText = "pkgs.opensmtpd"; description = "The OpenSMTPD package to use."; }; setSendmail = mkOption { type = types.bool; default = true; description = "Whether to set the system sendmail to OpenSMTPD's."; }; extraServerArgs = mkOption { type = types.listOf types.str; default = []; example = [ "-v" "-P mta" ]; description = '' Extra command line arguments provided when the smtpd process is started. ''; }; serverConfiguration = mkOption { type = types.lines; example = '' listen on lo accept for any deliver to lmtp localhost:24 ''; description = '' The contents of the smtpd.conf configuration file. See the OpenSMTPD documentation for syntax information. ''; }; procPackages = mkOption { type = types.listOf types.package; default = []; description = '' Packages to search for filters, tables, queues, and schedulers. Add OpenSMTPD-extras here if you want to use the filters, etc. from that package. ''; }; }; }; ###### implementation config = mkIf cfg.enable rec { users.groups = { smtpd.gid = config.ids.gids.smtpd; smtpq.gid = config.ids.gids.smtpq; }; users.users = { smtpd = { description = "OpenSMTPD process user"; uid = config.ids.uids.smtpd; group = "smtpd"; }; smtpq = { description = "OpenSMTPD queue user"; uid = config.ids.uids.smtpq; group = "smtpq"; }; }; security.wrappers.smtpctl = { group = "smtpq"; setgid = true; source = "${cfg.package}/bin/smtpctl"; }; services.mail.sendmailSetuidWrapper = mkIf cfg.setSendmail security.wrappers.smtpctl; systemd.tmpfiles.rules = [ "d /var/spool/smtpd 711 root - - -" "d /var/spool/smtpd/offline 770 root smtpq - -" "d /var/spool/smtpd/purge 700 smtpq root - -" ]; systemd.services.opensmtpd = let procEnv = pkgs.buildEnv { name = "opensmtpd-procs"; paths = [ cfg.package ] ++ cfg.procPackages; pathsToLink = [ "/libexec/opensmtpd" ]; }; in { wantedBy = [ "multi-user.target" ]; after = [ "network.target" ]; serviceConfig.ExecStart = "${cfg.package}/sbin/smtpd -d -f ${conf} ${args}"; environment.OPENSMTPD_PROC_PATH = "${procEnv}/libexec/opensmtpd"; }; }; }